src/mesa/main/version.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2010  VMware, Inc.  All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24
  25 #include "imports.h"
  26 #include "mtypes.h"
  27 #include "version.h"
  28 #include "git_sha1.h"
  29
  30 /**
  31  * Override the context's GL version if the environment variable
  32  * MESA_GL_VERSION_OVERRIDE is set. Valid values of MESA_GL_VERSION_OVERRIDE
  33  * are point-separated version numbers, such as "3.0".
  34  */
  35 static void
  36 override_version(struct gl_context *ctx)
  37 {
  38    const char *env_var = "MESA_GL_VERSION_OVERRIDE";
  39    const char *version;
  40    int n;
  41    int major, minor;
  42
  43    version = getenv(env_var);
  44    if (!version) {
  45       return;
  46    }
  47
  48    n = sscanf(version, "%u.%u", &major, &minor);
  49    if (n != 2) {
  50       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
  51       return;
  52    }
  53
  54    ctx->Version = major * 10 + minor;
  55 }
  56
  57 /**
  58  * Override the context's GLSL version if the environment variable
  59  * MESA_GLSL_VERSION_OVERRIDE is set. Valid values for
  60  * MESA_GLSL_VERSION_OVERRIDE are integers, such as "130".
  61  */
  62 void
  63 _mesa_override_glsl_version(struct gl_context *ctx)
  64 {
  65    const char *env_var = "MESA_GLSL_VERSION_OVERRIDE";
  66    const char *version;
  67    int n;
  68
  69    version = getenv(env_var);
  70    if (!version) {
  71       return;
  72    }
  73
  74    n = sscanf(version, "%u", &ctx->Const.GLSLVersion);
  75    if (n != 1) {
  76       fprintf(stderr, "error: invalid value for %s: %s\n", env_var, version);
  77       return;
  78    }
  79 }
  80
  81 /**
  82  * Examine enabled GL extensions to determine GL version.
  83  */
  84 static void
  85 compute_version(struct gl_context *ctx)
  86 {
  87    GLuint major, minor;
  88    static const int max = 100;
  89
  90    const GLboolean ver_1_3 = (ctx->Extensions.ARB_texture_border_clamp &&
  91                               ctx->Extensions.ARB_texture_cube_map &&
  92                               ctx->Extensions.ARB_texture_env_combine &&
  93                               ctx->Extensions.ARB_texture_env_dot3);
  94    const GLboolean ver_1_4 = (ver_1_3 &&
  95                               ctx->Extensions.ARB_depth_texture &&
  96                               ctx->Extensions.ARB_shadow &&
  97                               ctx->Extensions.ARB_texture_env_crossbar &&
  98                               ctx->Extensions.ARB_window_pos &&
  99                               ctx->Extensions.EXT_blend_color &&
 100                               ctx->Extensions.EXT_blend_func_separate &&
 101                               ctx->Extensions.EXT_blend_minmax &&
 102                               ctx->Extensions.EXT_fog_coord &&
 103                               ctx->Extensions.EXT_point_parameters &&
 104                               ctx->Extensions.EXT_secondary_color);
 105    const GLboolean ver_1_5 = (ver_1_4 &&
 106                               ctx->Extensions.ARB_occlusion_query &&
 107                               ctx->Extensions.EXT_shadow_funcs);
 108    const GLboolean ver_2_0 = (ver_1_5 &&
 109                               ctx->Extensions.ARB_point_sprite &&
 110                               ctx->Extensions.ARB_shader_objects &&
 111                               ctx->Extensions.ARB_vertex_shader &&
 112                               ctx->Extensions.ARB_fragment_shader &&
 113                               ctx->Extensions.ARB_texture_non_power_of_two &&
 114                               ctx->Extensions.EXT_blend_equation_separate &&
 115
 116                               /* Technically, 2.0 requires the functionality
 117                                * of the EXT version.  Enable 2.0 if either
 118                                * extension is available, and assume that a
 119                                * driver that only exposes the ATI extension
 120                                * will fallback to software when necessary.
 121                                */
 122                               (ctx->Extensions.EXT_stencil_two_side
 123                                || ctx->Extensions.ATI_separate_stencil));
 124    const GLboolean ver_2_1 = (ver_2_0 &&
 125                               ctx->Const.GLSLVersion >= 120 &&
 126                               ctx->Extensions.EXT_pixel_buffer_object &&
 127                               ctx->Extensions.EXT_texture_sRGB);
 128    const GLboolean ver_3_0 = (ver_2_1 &&
 129                               ctx->Const.GLSLVersion >= 130 &&
 130                               ctx->Const.MaxSamples >= 4 &&
 131                               ctx->Extensions.ARB_color_buffer_float &&
 132                               ctx->Extensions.ARB_depth_buffer_float &&
 133                               ctx->Extensions.ARB_half_float_pixel &&
 134                               ctx->Extensions.ARB_half_float_vertex &&
 135                               ctx->Extensions.ARB_map_buffer_range &&
 136                               ctx->Extensions.ARB_shader_texture_lod &&
 137                               ctx->Extensions.ARB_texture_float &&
 138                               ctx->Extensions.ARB_texture_rg &&
 139                               ctx->Extensions.ARB_texture_compression_rgtc &&
 140                               ctx->Extensions.EXT_draw_buffers2 &&
 141                               ctx->Extensions.ARB_framebuffer_object &&
 142                               ctx->Extensions.EXT_framebuffer_sRGB &&
 143                               ctx->Extensions.EXT_packed_float &&
 144                               ctx->Extensions.EXT_texture_array &&
 145                               ctx->Extensions.EXT_texture_shared_exponent &&
 146                               ctx->Extensions.EXT_transform_feedback &&
 147                               ctx->Extensions.NV_conditional_render);
 148    const GLboolean ver_3_1 = (ver_3_0 &&
 149                               ctx->Const.GLSLVersion >= 140 &&
 150                               ctx->Extensions.ARB_copy_buffer &&
 151                               ctx->Extensions.ARB_draw_instanced &&
 152                               ctx->Extensions.ARB_texture_buffer_object &&
 153                               ctx->Extensions.ARB_uniform_buffer_object &&
 154                               ctx->Extensions.EXT_texture_snorm &&
 155                               ctx->Extensions.NV_primitive_restart &&
 156                               ctx->Extensions.NV_texture_rectangle &&
 157                               ctx->Const.MaxVertexTextureImageUnits >= 16);
 158    const GLboolean ver_3_2 = (ver_3_1 &&
 159                               ctx->Const.GLSLVersion >= 150 &&
 160                               ctx->Extensions.ARB_depth_clamp &&
 161                               ctx->Extensions.ARB_draw_elements_base_vertex &&
 162                               ctx->Extensions.ARB_fragment_coord_conventions &&
 163                               ctx->Extensions.ARB_geometry_shader4 &&
 164                               ctx->Extensions.EXT_provoking_vertex &&
 165                               ctx->Extensions.ARB_seamless_cube_map &&
 166                               ctx->Extensions.ARB_sync &&
 167                               ctx->Extensions.ARB_texture_multisample &&
 168                               ctx->Extensions.EXT_vertex_array_bgra);
 169    const GLboolean ver_3_3 = (ver_3_2 &&
 170                               ctx->Const.GLSLVersion >= 330 &&
 171                               ctx->Extensions.ARB_blend_func_extended &&
 172                               ctx->Extensions.ARB_explicit_attrib_location &&
 173                               ctx->Extensions.ARB_instanced_arrays &&
 174                               ctx->Extensions.ARB_occlusion_query2 &&
 175                               ctx->Extensions.ARB_shader_bit_encoding &&
 176                               ctx->Extensions.ARB_texture_rgb10_a2ui &&
 177                               ctx->Extensions.ARB_timer_query &&
 178                               ctx->Extensions.ARB_vertex_type_2_10_10_10_rev &&
 179                               ctx->Extensions.EXT_texture_swizzle);
 180                               /* ARB_sampler_objects is always enabled in mesa */
 181
 182    if (ver_3_3) {
 183       major = 3;
 184       minor = 3;
 185    }
 186    else if (ver_3_2) {
 187       major = 3;
 188       minor = 2;
 189    }
 190    else if (ver_3_1) {
 191       major = 3;
 192       minor = 1;
 193    }
 194    else if (ver_3_0) {
 195       major = 3;
 196       minor = 0;
 197    }
 198    else if (ver_2_1) {
 199       major = 2;
 200       minor = 1;
 201    }
 202    else if (ver_2_0) {
 203       major = 2;
 204       minor = 0;
 205    }
 206    else if (ver_1_5) {
 207       major = 1;
 208       minor = 5;
 209    }
 210    else if (ver_1_4) {
 211       major = 1;
 212       minor = 4;
 213    }
 214    else if (ver_1_3) {
 215       major = 1;
 216       minor = 3;
 217    }
 218    else {
 219       major = 1;
 220       minor = 2;
 221    }
 222
 223    ctx->Version = major * 10 + minor;
 224
 225    override_version(ctx);
 226
 227    ctx->VersionString = (char *) malloc(max);
 228    if (ctx->VersionString) {
 229       _mesa_snprintf(ctx->VersionString, max,
 230                      "%u.%u Mesa " MESA_VERSION_STRING
 231 #ifdef MESA_GIT_SHA1
 232                      " (" MESA_GIT_SHA1 ")"
 233 #endif
 234                      ,
 235                      ctx->Version / 10, ctx->Version % 10);
 236    }
 237 }
 238
 239 static void
 240 compute_version_es1(struct gl_context *ctx)
 241 {
 242    static const int max = 100;
 243
 244    /* OpenGL ES 1.0 is derived from OpenGL 1.3 */
 245    const GLboolean ver_1_0 = (ctx->Extensions.ARB_texture_env_combine &&
 246                               ctx->Extensions.ARB_texture_env_dot3);
 247    /* OpenGL ES 1.1 is derived from OpenGL 1.5 */
 248    const GLboolean ver_1_1 = (ver_1_0 &&
 249                               ctx->Extensions.EXT_point_parameters);
 250
 251    if (ver_1_1) {
 252       ctx->Version = 11;
 253    } else if (ver_1_0) {
 254       ctx->Version = 10;
 255    } else {
 256       _mesa_problem(ctx, "Incomplete OpenGL ES 1.0 support.");
 257    }
 258
 259    ctx->VersionString = (char *) malloc(max);
 260    if (ctx->VersionString) {
 261       _mesa_snprintf(ctx->VersionString, max,
 262                      "OpenGL ES-CM 1.%d Mesa " MESA_VERSION_STRING
 263 #ifdef MESA_GIT_SHA1
 264                      " (" MESA_GIT_SHA1 ")"
 265 #endif
 266                      ,
 267                      ctx->Version % 10);
 268    }
 269 }
 270
 271 static void
 272 compute_version_es2(struct gl_context *ctx)
 273 {
 274    static const int max = 100;
 275
 276    /* OpenGL ES 2.0 is derived from OpenGL 2.0 */
 277    const GLboolean ver_2_0 = (ctx->Extensions.ARB_texture_cube_map &&
 278                               ctx->Extensions.EXT_blend_color &&
 279                               ctx->Extensions.EXT_blend_func_separate &&
 280                               ctx->Extensions.EXT_blend_minmax &&
 281                               ctx->Extensions.ARB_shader_objects &&
 282                               ctx->Extensions.ARB_vertex_shader &&
 283                               ctx->Extensions.ARB_fragment_shader &&
 284                               ctx->Extensions.ARB_texture_non_power_of_two &&
 285                               ctx->Extensions.EXT_blend_equation_separate);
 286    if (ver_2_0) {
 287       ctx->Version = 20;
 288    } else {
 289       _mesa_problem(ctx, "Incomplete OpenGL ES 2.0 support.");
 290    }
 291
 292    ctx->VersionString = (char *) malloc(max);
 293    if (ctx->VersionString) {
 294       _mesa_snprintf(ctx->VersionString, max,
 295                      "OpenGL ES 2.0 Mesa " MESA_VERSION_STRING
 296 #ifdef MESA_GIT_SHA1
 297                      " (" MESA_GIT_SHA1 ")"
 298 #endif
 299                      );
 300    }
 301 }
 302
 303 /**
 304  * Set the context's Version and VersionString fields.
 305  * This should only be called once as part of context initialization
 306  * or to perform version check for GLX_ARB_create_context_profile.
 307  */
 308 void
 309 _mesa_compute_version(struct gl_context *ctx)
 310 {
 311    if (ctx->Version)
 312       return;
 313
 314    switch (ctx->API) {
 315    case API_OPENGL:
 316    case API_OPENGL_CORE:
 317       compute_version(ctx);
 318       break;
 319    case API_OPENGLES:
 320       compute_version_es1(ctx);
 321       break;
 322    case API_OPENGLES2:
 323       compute_version_es2(ctx);
 324       break;
 325    }
 326
 327 }